It adopts European B standard, with 3-time or 1-time pre-Vacuum preceding vacuum drying. Residual humidity is<0.2; Vacuum measurement reaches -0.80bar. It sterilizes and sanitizes miscellaneous packed or unpacked medical instruments, whether solid or hollow, whether with B-type hollow and B-type hollow multi-apertures or inset pipes. It efficiently rids air from every hollow area of any hollow instrument, such as hand piece, making sure that water steam reaches every corner.